Thomas Hofstätter from Vienna, Austria and Leon Dombroski from Connecticut talk about the global problem of light pollution, which sadly affects not only amateur astronomers but all humans, animals and plants. In response to this growing problem, some cities have decided to make changes to reduce the amount of light pollution.
What is stated over and over again when the topic of light pollution is discussed is that most of the light pollution can be avoided by simple modifications of lighting fixtures, which also save energy and money. Not only are streetlights and bright home lighting causes of light pollution but also building illumination and billboards spill far too much light into the night sky obscuring stars and killing wildlife.
Have a listen here! 365 Days of Astronomy – Against Light Pollution